Machine for slotting heels



May 10, 1938. G; HAZELTON MACHINE FOR SLOTTING HEELS Filed Jan. 9, 19562 Sheets-Sheet l May 10, 1938. G. HAZELTON MACHINE FOR SLOTTING HEELS 2Sheets-Sheet 2 Filed Jan. 9, 1956 Patented May 10, 1938 UNITED STATESPATENT oFFicE MACHINE FOR SLO-TTING HEELS Application January 9, 1936,Serial No. 58,327 In Great Britain March 23, 1935 10 Claims.

This invention relates to the manufacture of shoes and is illustratedherein as embodied in a machine for forming slots in the breasts ofheels.

In United States Letters Patent No. 2,046,454, granted July '7, 1936 onan application filed in the names of Hazelton, James and Bacon, there isdisclosed a machine for forming in the breast of a pre-finished Cubanheel made up of a plurality of lifts, a slot which is V-shaped in crosssection and extends transversely of the breast of the heel adjacent tothe attaching face of the heel, the slot being of suitable size toreceive the rear end of the short outsole of the shoe to which the heelis later to be attached. A shoe comprising the above-mentioned heel andoutsole is disclosed in detail in United States Letters Patent No.2,027,431, granted January 14, 1936 on an application filed in the namesof I-Iazelton, James and Bacon.

There is a tendency for the heel to move rapidly against theslot-forming cutter of the above machine with the result that the heelmaterial adjacent to the slot is sometimes scorched or burned. Thefeeding of the heel too rapidly against the cutter is partly due to thetendency of the cutter to draw the work but is largely the result of thenatural desire on the part of the operator who manually controls themovement of the heel, to hasten the operation.

In order to control the speed of presentation of the heel to the cutterand in accordance with a feature of this invention, there is provided amachine comprising a cutter, a carrier for a shoe part such, forexample, as a heel, manually operated means for moving the carrier, andmechanically operated means for enabling the carrier to be moved towardthe cutter by the manually operated means at a predetermined speed. Inthe illustrated machine, movement of the heel which is positioned uponthe carrier, toward the cutter to form a slot such as above described,may be stopped at any stage of the operation, but the speed of thecarrier and therefore the speed of the heel toward the cutter cannot bevaried. The speed at which the carrier can be moved is so chosen thatthe movement of the heel toward the cutter is sufficiently slow toinsure. that the heel shall not be scorched and that a well-defined slotis formed in the heel.

The invention will be better understood and appreciated after readingthe following description in connection with the accompanying drawings,in which Fig. 1 is a side view of the illustrated machine, parts ofwhich have been broken away;

Fig. 2 is an enlarged plan View of the work carrier of the machine;

Fig. 3 is a detail front view of the lower end of a post which supportsthe work carrier;

Fig. 4 is a sectional view taken along line IV-IV of Fig. 3;

Fig. 5 is a detail sectional view taken along line V-V of Fig. 2; and

Fig. 6 is a perspective view of a heel the breast of which has beenslotted by the use of the above machine.

The illustrated machine is described with reference to forming a slot 20(Fig. 6) in the breast of a pre-finished Cuban heel 22 comprising aplurality of lifts 24. The slot 22 is V-shaped in cross section and isformed and arranged to receive the rear end of a short outsole (notshown).

The machine comprises a rotary barrel cutter or saw 26 (Fig. 1) which ismounted upon a shaft 28 and has a plurality of elongated cutting teeth30, a carrier 32 for supporting the heel 22, and mechanism for movingthe heel against the cutter after it has been positioned upon andclamped to the carrier, thereby forming the slot 20 in the breast of theheel.

The carrier 32 comprises a Work plate 34 (Fig. 5) and a slide 38 whichis secured by screws 36 to the work plate and which is mounted formovement along an undercut slideway 40 of a guide plate 42. The heel ispositioned widthwise and lengthwise upon the carrier 32 by a pair ofgages 44 (Fig. 2) adjustable along slideways 46 of the carrier uponturning a screw 48 which is rotatably mounted upon the carrier.Right-hand and lef hand threaded portions 50', 52 of the screw 48 are inthreaded engagement with the respective gages 44, and when the screw isturned the gages are moved equal distances toward and away from acentral plane 54 of the carrier 32.

In order to insure that the heel 22 shall be stably supported upon thecarrier 32, a plate 56 having a convex heel-engaging face 58 is securedto the carrier by a screw 60 (Fig. 2). The gages 44 comprise upwardlyextending arms 62 (Fig. l) which are provided with abutments 64 (Fig. 2)formed to engage opposite sides of the heel 22 for positioning the samewidthwise upon the carrier 32, the arms 62 also being provided withstops 66 against which the breast of the heel is forced to position theheel lengthwise upon the carrier. Since the heel 22 is tapered theabutments 6 1 tend to force the heel against the plate 56 as they arepressed against the sides of the heel.

In order to force the heel against the stops 66 there is provided aclamp 68 which is pivotally mounted upon trunnions I0 (Fig. ,1)extending from an upstanding boss I2 of the carrier 32. The clamp 68comprises a pad I4 pivotally mounted upon the forward end of a rod I6which is adjustably secured through the provision of a set screw 18,within a bore of a housing to which an upstanding handle 82 is attached.A spring 84 (Fig. 2) is provided to force the heel-engaging pad I4against the forward portion of the rod I6 thereby insuring that the padshall not turn upon the rod under its own weight when the clamp 68 israised to an inoperative position. The clamp 74 is forced against theheel by a spring 86 (Fig. 1) the upper and lower ends of which aresecured to the housing 80 and to the guide plate 42, respectively. Thetrunnions ID are so positioned with relation to the spring 88 that whenthe rear end of the housing 88 is swung against a projecting lug 88 ofthe carrier 32, the spring 86 is moved to a, horizontal position andretains the housing in engagement with the lug 88.

The carrier 32 has a depending extension (Figs. 1 and 5) which extendsthrough a slot 9i (Figs. 2 and 5) in the guide plate 42 and is providedwith a recess 92 constructed and arranged to receive the non-threadedshank of a lead screw 94 which is in threaded relation with a thrustcollar 96 (Fig. 1) secured within a post 98. The guide plate 42 issecured to the upper end of the post 98 and is also rigidly connected tothe post by a pair of braces I00.

The carrier 32 is operated by a hand lever I02 which is fulcrumed upon astud I04 secured to the guide plate 42 and which has an elongated slotI06 (Figs. 2 and 5) shaped to receive a pin I08 secured to the carrier32. The handle III) of the lever I02 may be manually moved back to itsstarting position but is usually swung toward the operator after theslot 20 has been formed in the heel 22 under the action of a spring II2.One end of the spring H2 is attached to an extension II4 of the leverI02 and the other end of the spring is secured to a rod II6 attached tothe guide plate 42. The carrier 32 is moved toward the cutter 26 byswinging the lever I02 rearwardly, that is, toward the cutter 26, and ismoved away from the cutter through the above-described mechanism.Movement of the carier 32 toward the cutter 26 is limited by engagementof a stop screw I I8 which is in threaded relation with the lug 88 ofthe carrier, against a shoulder I 20 of the guide plate 42. Movement ofthe carrier 32 away from the cutter 26 is limited by engagement of thedepending extension 90 of the carrier with the rear end I22 (Fig. 2) ofthe slot 9I.

The speed of presentation of the work to the cutter 26 is limited bymechanism which will now be described. A pair of pulleys I24, I26(Fig. 1) are loosely mounted upon the lead screw 94 at the oppositesides of the depending extension 90 of the carrier 32. The pulleys I24and I26 are continuously operated by belts I28, I30, respectively, whichare driven by pulleys I32, I34, respectively, keyed to a drive shaftI36. Clutch disks I38, I40 positioned adjacent to the pulleys I24 andI26, respectively, are pinned to the lead screw 94. It will be notedthat the belt I28 is crossed and the pulley I32 is relatively small inorder that the pulley I24 may be rotated at a low speed in acounterclockwise direction, as viewed from the front of the machine. Thebelt I30 is open and engages a large pulley I34 in order to drive thepulley I26 at a relatively high speed in a counterclockwise direction.The lead screw 94 is normally stationary since neither of the pulleysI24,

I26 is forced against its corresponding clutch disk.

When the operator swings the lever I02 toward the cutter 26 thedepending extension 90 of the carrier 32 forces the pulley I24 againstthe clutch disk I38 thereby causing the lead screw 94 to rotate in aclockwise direction as viewed from the left in Fig. 1. As the lead screw94 rotates it moves in the direction of its axis of rotation toward thecutter 26 at a predetermined speed depending upon the pitch of thethread of the lead screw and upon the speed of rotation of the driveshaft I36. After the stop screw II8 (Fig. 1) has engaged the shoulderI20 of the guide plate 42, the pulley I24 ceases to press against theclutch disk I38 thereby causing the lead screw 94 to come to rest.

It is customary, as above stated, for the operator to remove his handfrom the lever I02 after the slot 20 has been formed thereby causing thelever to return to its starting position under the action of the springII2. Movement of the lever I02 away from the cutter 26 causes thedepending extension 90 of the carrier 32 to force the pulley I26 againstthe clutch disk I40 thereby causing the lead screw 94 to rotate rapidlyin a clockwise direction and thereby permitting the carrier 32 to returnquickly to its starting position. As above stated, movement of thecarrier 32 away from the cutter 26 is limited by engagement of thedepending extension 90 with the forward end I22 (Fig. 2) of the opening9I formed in the guide plate 42.

It is desirable that the mechanism supported by the post 98 be swung toone side preparatory to removing the cutter 26 from the shaft 28.Accordingly, the post 98 has a bracket I42 secured to its lower end, thebracket being mounted upon a bearing I44 supported by a slide I46. Theslide I46 may be adjusted to different heightwise positions along aguideway I48 formed in a frame I50 secured to a column I52, by turning aset screw I54 which is rotatably mounted in the frame I50 and is inthreaded engagement with the slide I46. The post 98 is held in theupright position shown in Figs. 1 and 2 by a pin I56 secured to theslide I 46 and constructed and arranged to engage within an arcuaterecess I58 (Fig. 3) formed in the post 98. The pin I56 is clampedagainst the bottom of the arcuate recess I58 to retain the post 98 in anupright position, through the provision of a screw I60 which is inthreaded engagement with an angle arm I62 (Fig. 4) pivotally connectedto a collar I64 mounted upon the "pin. When it is desired to swing thepost 98 about the bearing I44 preparatory to removing the cutter 32 fromthe machine, the screw I60 is loosened and the post 98 is swung in aclockwise direction (Fig. 3) after the angle arm I62 has been pushedrearwardly out of the path of movement of the post 98.

The cutter shaft 28 is mounted in bearings I66 housed within the upperend of the column I52 and is rotated by a pulley I68 which is keyed tothe shaft and is operated by a belt I10.

Having described my invention, what I claim as new and desire to secureby Letters Patent of the United States is:

1. A machine for operating upon shoe parts having, in combination, acutter, a carrier for a shoe part, manually operated means for movingthe carrier, and mechanically operated means for enabling the carrier tobe moved toward the cutter by said manually operated means at apredetermined speed.

2. A slotting machine having, in combination,

a cutter, a carrier for a heel, means for positioning the heel upon thecarrier, manually operated means for moving the carrier, andmechanically operate-d means for enabling the carrier to be moved towardthe cutter by said manually operated means at a predetermined speed toform a slot in the heel.

3. A slotting machine having, in combination, a cutter, a carrier for aheel, means for positioning the heel upon the carrier, manually operatedmeans for moving the carrier toward the cutter, and mechanicallyoperated means for limiting the speed of the carrier moved toward thecutter by said manually operated means, the operation of the means forlimiting the speed of the car- 'rier being dependent upon the operationof the manually operated means.

4. A slotting machine having, in combination, a rotary saw, a carrierfor a heel, means for positioning the heel upon the carrier and forsecuring the heel to the carrier, manually operated means for moving thecarrier toward and away from the saw, and mechanism rendered operativeby said manually operated means for permitting the carrier to be fed ata relatively low speed toward the saw and at a relatively high speedaway from the saw.

5. A slotting machine having, in combination, a rotary saw, a carrierfor a heel, means for positioning the heel upon the carrier and forsecuring the heel to the carrier, manually operated means for moving thecarrier toward the, saw to form a slot in the heel, and mechanismrendered operative by said means for limiting the rate of feed of thecarrier to insure the formation of a properly formed slot in the heel.

6. A slotting machine having, in combination, a rotary saw, a carrierfor a heel, means for positioning the heel upon the carrier and forsecuring the heel to the carrier, a lead screw movable lengthwise of itsaxis, a driven pulley loosely mounted upon said screw, a clutch disksecured to said screw, and manually controlled means for causing thecarrier to force the pulley against the disk thereby causing the screwto move toward the saw and to regulate the speed of the heel upon thecarrier toward the saw.

7. A slotting machine having, in combination, a rotary cutter, a carrierhaving an extension, means for positioning a heel upon the carrier andfor securing the heel to the carrier, an internally threaded thrustcollar, a lead screw in threaded engagement with the collar and havingits axis of rotation arranged at a substantial angle to the plane ofrotation of the cutter, a pulley loosely mounted upon the lead screw andpositioned adjacent to the extension of the carrier, means for drivingthe pulley, a clutch member secured to the lead screw, and a lever formoving the carrier lengthwise of the lead screw to cause the extensionof the carrier to force the pulley against the clutch member therebymoving the screw lengthwise. of its axis and permitting the carriage tobe fed at a predetermined rate toward the cutter.

8. A slotting machine having, in combination, a rotary saw, a carrierhaving an extension, means for positioning a heel upon the carrier andfor securing the heel to the carrier, an internally threaded thrustcollar, a rotatable lead screw in threaded engagement with the collarand having its axis of rotation arranged at a right angle to the planeof rotation of the saw, a pair of spaced pulleys loosely mounted uponthe lead screw and positioned at opposite sides of the extension of thecarrier, means for driving the pulleys in opposite directions upon thelead screw, a pair of clutch members secured to the lead screw adjacentto the respective pulleys, a lever for moving the carrier in thedirection of the axis of rotation of the lead screw to cause theextension of the carrier selectively to force one of the pulleys againstan adjacent clutch member thereby causing the clutch member to movelengthwise of said axis with the lead screw and permitting the carriageto be fed by said lever at a speed equal to the speed of the screw inthe direction of its axis of rotation.

9. A slotting machine having, in combination, a rotary barrel saw, acarrier having an extension, means for positioning a heel upon thecarrier and for securing the heel to the carrier, an internally threadedthrust collar, a lead screw in threaded engagement with said collar andhaving its axis of rotation arranged at a substantial angle to the planeof rotation of the saw, a pulley loosely mounted upon the lead screw andpositioned adjacent to the extension of the carrier, means for drivingthe pulley, a clutch member secured to the lead screw, a lever formoving the carrier in the direction of the axis of rotation of the leadscrew to cause the extension of the carrier to force the pulley againstthe clutch member thereby causing the screw to move along said axis andpermitting the carriage to be fed at a predetermined speed toward thecutter, and a frame upon which the carrier and the thrust collar aresupported, said frame being mounted for swinging movement to permit thecutter to be removed from the machine.

10. A machine for operating upon shoe parts having, in combination, acutter, a carrier for a shoe part, manually operated means for effectingrelative movement between the carrier and the cutter to cause the.cutter progressively to operate upon the shoe part, and mechanicallyoperated means rendered operative by said manually operated means forcontrolling the rate of said relative movement between the carrier andthe cutter.

GEORGE I-IAZELTON.

